I have a weird problem that occurs sometimes when I have external hard drives or USB thumb drives attached to my computer. I sometimes experience extreme keyboard input lags (up to the point of no input reaction at all). This only occurs when I have a USB thumb drive attached to the front USB ports on my case and now most recently it also occurred with a external hard drive attached to one of the back side USB ports. All lag problems disappear at ounce as soon as I disconnect the drive from USB port. Even stranger, I can't really replicate the problem, because it doesn't happen all the time. Most of the time I have no lag problem with USB drives attached. But it happens frequent enough to be highly annoying. Any ideas what could cause this and how to fix it? Thanks!!